Dosimetric evaluation of image-guided radiation therapy for prostate cancer

Prostate cancer is the most common malignancy in North American males and the second leading cause of cancer death. External beam radiation therapy plays an important role in the clinical management of prostate cancer of various stages. Currently, image-guided target localization for intensity-modulated radiation therapy (IMRT) of prostate cancer has become a routine procedure, and plays an essential role in dose escalation and hypo-fractionation clinical trials, especially for those that employ stereotactic body radiation therapy (SBRT) techniques.
Source: Medical Dosimetry - Category: Radiology Authors: Source Type: research

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CONCLUSIONS: We found significant variation in the published literature on target delineation, margins used, dose/fractionation, and treatment schedule. Despite this variation, TCP was excellent. Most prescription doses range from 35 to 40 Gy, delivered in 4 to 5 fractions. The literature did not provide detailed dose-volume data, and our dosimetric analysis was constrained to prescription doses. There are many areas in need of continued research as SBRT continues to evolve as a treatment modality for prostate cancer, including the durability of local control with longer follow-up across risk groups, the efficacy and safet...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Int J Radiat Oncol Biol Phys Source Type: research
CONCLUSIONS: Luteinizing hormone-releasing hormon antagonists may reduce acute urinary tract toxicity during prostate cancer external beam radiotherapy compared with luteinizing hormone-releasing hormon agonists, in particular in patients with moderate to severe symptoms at the start of treatment. PMID: 32875317 [PubMed - as supplied by publisher]
Source: Clinical Prostate Cancer - Category: Cancer & Oncology Authors: Tags: Jpn J Clin Oncol Source Type: research
Authors: Konat-Bąska K, Chicheł A, Staszek-Szewczyk U, Maciejczyk A, Matkowski R Abstract Purpose: Prostate and colorectal cancers are the first and the third most popular malignancies in male population, in which some patients may develop these tumors metachronously or synchronously. At present, there are no standard recommendations, and oncologists need to provide an optimal management for two different cancers with an acceptable risk of possible treatment of adverse effects. Material and methods: This case report presents the treatment of a 61-year-old patient suffering from synchronous prostate and rectal...
Source: Journal of Contemporary Brachytherapy - Category: Cancer & Oncology Tags: J Contemp Brachytherapy Source Type: research
Dose-escalated external beam radiation therapy results in improved outcomes for patients with prostate cancer, but at the cost of increased gastrointestinal toxicity [1 –3]. Indeed, the prostate is not a static organ, and nearby critical structures present a limiting factor to delivering higher doses to the target volume. Methods including image-guided radiation therapy (IGRT) and intensity modulated radiation therapy (IMRT) have been developed to help reduce tox icity rates by improving confidence in target localization and by increasing dose conformity, respectively.
Source: Radiotherapy and Oncology - Category: Radiology Authors: Tags: Original Article Source Type: research
AbstractProstate cancer is the most common cancer among men in the USA. Interestingly, recent studies suggest that patients with inflammatory bowel disease (IBD) are at increased risk of developing prostate cancer. Importantly, patients with IBD who develop prostate cancer require thoughtful care when using immunosuppressants to treat the IBD in the setting of malignancy. Further, consideration must be given to the proximity of the prostate to the gastrointestinal tract when treating with radiation where there is concern for the effects of inadvertent exposure of radiation to the diseased bowel. In general, management of i...
Source: Digestive Diseases and Sciences - Category: Gastroenterology Source Type: research
In the treatment of prostate cancer using external beam radiotherapy (EBRT), the motion of the prostate gland affects an accurate delivery of the treatment dose. Image-guided radiotherapy (IGRT) is understood as the use of imaging technology to secure localization of the target position during treatment. IGRT is essential for compensating the motion of the prostate gland in the patient during radiotherapy, ensuring that dose distributions are deposited correctly. The use of IGRT is especially important when modern techniques utilizing highly conformal dose distributions such as intensity-modulated radiation therapy (IMRT) ...
Source: Radiotherapy and Oncology - Category: Radiology Authors: Tags: Original Article Source Type: research
ConclusionDifferent medical physicists or dosimetrists, photon energies, treatment planning systems, and treatment machines have an impact on the resulting dose distribution. However, the differences only become apparent when comparing DVH, analysing dose values, comparing CI, HI, GI, as well as reviewing the dose distribution in every single plane. A  new score was introduced to identify treatment plans that simultaneously deliver a low dose to all OAR. Such inter- and intra-institutional comparison studies are needed to explore different treatment planning strategies; however, there is still no automatic soluti...
Source: Strahlentherapie und Onkologie - Category: Cancer & Oncology Source Type: research
te; N Abstract Brachytherapy has the unique characteristic of being able to deliver high doses to a very localized volume, and remains one of the radiotherapy techniques that has an unparalleled therapeutic index. However, its use has been declining in the past years. Globally, only 55 to 88 % of patients with locally advanced cervical cancer benefit from utero-vaginal brachytherapy, despite the fact that it is proven to enhance both progression-free and overall survival. A decline in the use of low dose rate brachytherapy has likewise been described in the treatment of low-risk and favorable intermediate-ris...
Source: Bulletin du Cancer - Category: Cancer & Oncology Authors: Tags: Bull Cancer Source Type: research
Conclusions: 3D-HDR-BT achieves favorable clinical outcomes with mild late toxicity in patients with locally rNPC. Introduction Nasopharyngeal carcinoma (NPC), a tumor of epithelial origin, is a malignant disease of the head and neck common in southern China, especially in Guangdong province (1). As a result of advances in modern imaging and irradiation techniques, the 5-year overall survival (OS) of patients with newly diagnosed NPC without metastasis has reached 75% after external beam radiotherapy (EBRT) in Asia (2, 3). However, local recurrence, which occurs in 18–40% of patients, remains a major reason for...
Source: Frontiers in Oncology - Category: Cancer & Oncology Source Type: research
Abstract External beam radiation therapy for prostate cancer can result in urinary, sexual, and rectal side effects, often impairing quality of life. A polyethylene glycol-based product, SpaceOAR© hydrogel (SOH), implanted into the connective tissue between the prostate gland and rectum can significantly reduce the dose received by the rectum and hence risk of rectal toxicity. The optimal way to manage the hydrogel and rectal structures for plan optimization is therefore of interest. In 13 patients, computerized tomography (CT) scans were taken pre- and post-SpaceOAR© implant. A prescription of 60 G...
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research
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